Tylosaurus

noun

Ty·​lo·​sau·​rus

ˌtīləˈsȯrəs

: a genus of large pythonomorph reptiles from the Upper Cretaceous of Kansas, New Mexico, and Texas having a short body, long tail, and pentadactyl limbs functioning as paddles

Word History

Etymology

New Latin, from tyl- + -saurus

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now